Originally Posted by
John E
Are you sure about the BB shell width? How about the cups? 36x24 would cinch it as an Italian build, which I suspect from the tre tubi frame pedigree label; 1.375x24 would be Japanese. L.8 4467 looks a little strange to me -- I am more accustomed to Bianchi S/Ns such as 2F51703 (1962 Corsa, my first road bike and first new bike) and 1.M9914 (1981 Camp. d'Italia, my current Bianchi).
No, not entirely sure - that's why I want to re-measure tomorrow once I have crankset off. And no indication of threading outside. It does not look like Japanese BB's I worked on before - lockring looks the same but cup have shape of regular nut.
Re S/N - several threads I digged out and Bianchi S/N thread have same as mine format S/N listed. Need to find them again - L stands for some kind of number as well. Folks reported same location as well - letter and number on non-drive side and 4 digits on the drive side.